I have the Antigravity Micro Start , the old style was still on sale for around $65.00 to the door a mouth ago. I travel with it on my bike to charge phone , flashlights and the Bluetooth device on my helmet for long trips across the US.. I used it to start a Fully loaded V-Six Subaru that had a dead flat battery that would not light the headlights (45 degrees F) Very happy with it and small enough for your back pocket.